01 - Preheat oven to 425°F. Line a large sheet pan with parchment paper or aluminum foil to facilitate easy cleanup.
02 - Place the sliced bell peppers, zucchini, cherry tomatoes, and red onion onto the prepared sheet pan in a single, even layer.
03 - In a mixing bowl, whisk together the melted butter, minced garlic, chopped parsley, lemon juice, smoked paprika, salt, black pepper, and red pepper flakes until fully combined.
04 - Drizzle half of the garlic butter mixture over the arranged vegetables. Toss gently to ensure all pieces are evenly coated.
05 - Transfer the sheet pan to the oven and roast the vegetables for 8 minutes to begin softening.
06 - Carefully remove the pan from the oven. Distribute the shrimp evenly over the partially cooked vegetables.
07 - Drizzle the remaining garlic butter sauce over the shrimp and vegetables. Return the pan to the oven and roast for 7 to 8 minutes, or until the shrimp are opaque and curled.
08 - Serve the dish immediately while hot, garnished with additional chopped parsley and fresh lemon wedges.